Laminated transformer and method for manufacturing laminated transformer

Abstract

A laminated transformer includes a magnetic substance layer, a coil lamination stacked on the magnetic substance layer, the coil lamination having formed thereinside a primary coil and a secondary coil, the primary coil being wound spirally in convolutions in a stacking direction, the secondary coil being wound spirally in convolutions in the stacking direction and formed inside the primary coil, a magnetic substance filling inside of the secondary coil in the coil lamination, and a non-magnetic substance filling a region between the primary coil and the secondary coil and filling outside of the primary coil in the coil lamination.

What is claimed is: 
     
         1 . A laminated transformer comprising:
 a magnetic substance layer;   a coil lamination stacked on the magnetic substance layer, the coil lamination having formed thereinside a primary coil and a secondary coil, the primary coil being wound spirally in convolutions in a stacking direction, the secondary coil being wound spirally in convolutions in the stacking direction and formed inside the primary coil;   a magnetic substance filling inside of the secondary coil in the coil lamination; and   a non-magnetic substance filling a region between the primary coil and the secondary coil and filling outside of the primary coil in the coil lamination.   
     
     
         2 . The laminated transformer according to  claim 1 , wherein
 the coil lamination comprises a plurality of print pattern layers including first coil patterns representing the primary coil and second coil patterns representing the secondary coil, the second coil patterns being printed inside the first coil patterns, and   at least one of the print pattern layers includes two first coil patterns and two second coil patterns.   
     
     
         3 . A method for manufacturing a laminated transformer, the method comprising:
 a step of printing to form print pattern layers by screen printing first coil patterns representing a primary coil, second coil patterns representing a secondary coil, and magnetic patterns;   a step of forming a coil lamination including the print pattern layers that are stacked one on top of another through the screen printing performed repeatedly; and   a step of stacking the coil lamination on a magnetic substance layer, wherein   the step of printing includes, in the print pattern layers, screen printing of the magnetic patterns formed in regions inside the second coil patterns, screen printing of non-magnetic patterns formed in regions between the first coil patterns and the second coil patterns, and screen printing of the non-magnetic patterns formed outside the first coil patterns, and   the step of forming of the coil lamination includes:
 forming of the primary coil being wound spirally in convolutions in a stacking direction, through an interlayer connection made between the first coil patterns; 
 forming of the secondary coil being wound spirally in convolutions in the stacking direction inside the primary coil, through an interlayer connection made between the second coil patterns; 
 forming of a magnetic substance filling inside of the secondary coil through an interlayer connection made between the magnetic patterns; and 
 forming of a non-magnetic substance filling a region between the primary coil and the secondary coil and filling outside of the primary coil through an interlayer connection made between the non-magnetic patterns.